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# A is a lighter phenol and B is an aromatic carboxylic acid. separation of a mixture of A and B can be carried out easily by using a solution of

(a) Sodium hydroxide (b) Sodium sulphate (c)Calcium chloride (d)Sodium bicarbonate

Sodium bicarbonate $(NaHCO_3)$ Since carboxylic acids dissolve in $NaHCO_3$ but phenols do not.
Hence d is the correct answer.